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Trac Loc?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by laketex, May 9, 2000.

  1. laketex

    laketex 3/4 ton status

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    Got a chance to buy a trac-loc for my D44 frontend for 50 bucks. It's out of a jeep and I'm building both axles anyways with a Detroit rear. Had planned on an open front, but what do yall think about the tracloc? I've heard it called a trash lock, but for 50 bucks is it worth it? Or would yall recommend just leaving the front open and adding a lockright somewhere down the road when money gets a little better?

    [​IMG][​IMG]
    Durant, Ok
    '79 Blazer in progress
     
  2. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Trac-Loc's are not real positive but they would be better than an open diff. They also wear out over time so I would recommend having it rebuilt before spending the money to install it. Find somebody familiar with them and they should be able to do some things to it so it will be more positive (such as stiffer springs and re-arranging the clutch packs, etc..)......but remember, it still won't be a real positive diff.
     
  3. Executioner

    Executioner 1/2 ton status

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    Are you speaking from expecience or opinion ?
    Can you please explain the spring thing and the clucht pack ?
    Oh and we are taking about a Dana (Spicer) 44 Trac-Lok right ?
    Please
    TIA
     
  4. Executioner

    Executioner 1/2 ton status

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    FYI it is not worth $50.00, IMHO I will explain it to you if the other posters don't get the accuracy right.
     
  5. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I have experience with Trac Lok equipped vehicles from both my work and from fourwheeling. I also work directly with Dana/Spicer technicians at times and do testing on Trac Lok equipped vehicles on a regular basis.
    I don't know the detailed specifics about rebuilding them, but I have talked to the Dana technicians about them and that was what they said (concerning making them more positive with different springs and such). Basically the "limited slip" between the left and right tires is accomplished through clutch packs that connect the left and right sides. The clutch packs are pre-loaded (or pushed together) by springs, so the harder the spring pushes on the clutches, the less slip in the clutches and the more positive the diff becomes. Installing stronger springs, or shimming the springs, gives the clutch pack more pre-load, and thus less slip. Rearranging the clutch plates in the pack, from what I understand, can accomplish the same thing.
    The Trac Loks for different axles are basically the same design (ie. Dana 44, 35, 60, 70, 80 etc......)
     
  6. Burt4x4

    Burt4x4 3/4 ton status

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    Isn't the Power-Lok A much tighter unit also made by Dana??
    I think I rember reading that the Power-Lok is the tightest and strongest 'posi' that Dana makes!??.....

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Yes, the Power Lok is a much tighter posi than the Trac Lok and made by Dana. Same basic design, just tighter springs and (I think) a larger clutch pack. I am not aware of the Power Lok being offered as a factory option.
     
  8. Executioner

    Executioner 1/2 ton status

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    Just wondering have you ever saw any of the springs you mentioned ?
     
  9. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Uhhhhh.........why do you ask??
     
  10. Burt4x4

    Burt4x4 3/4 ton status

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    Everytime I change the diff oil I see mine!
    WHy do you ask??
    You can look for a pic on the web if you would like to see what we are talking about. Or even seen them in some of the mags I read.

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  11. Executioner

    Executioner 1/2 ton status

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    Because all the Dana(Spicer) Trac-Lok that I have seen do not have springs.
    We are talking about a coil spring, kinda like the coil springs up front on some IFS 4X4's just smaller ?
     
  12. Executioner

    Executioner 1/2 ton status

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    Are you talking about your front end Dana(Spicer) 44 ?
     
  13. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Front, rear, it's all the same. You cannot see the springs in a Trac Lok without disassmbling it.
     
  14. Executioner

    Executioner 1/2 ton status

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    Thanks for your time, and posts.
    If you ever see on of these springs if you could please post a picture, or a web site that might
    alreadly have one.
     
  15. Burt4x4

    Burt4x4 3/4 ton status

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    Executioner, Here are some samples I found. This is from Auburn Gears web site, couldn't find a Dana product but its the same idea anyway...http://www.auburngear.com/402.htm[/...rums/images/icons/cool.gif[/img] Led Zeppelin
     
  16. Emmettology 101

    Emmettology 101 3/4 ton status

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    Detroit Trac-Loks do not have clutches, they are all gear driven!

    I think they would be really nice in the front end... For $50 bucks, I would dive on it.

    If you dont buy it, let me know, I'll buy it!!!!!!

    Mike
    82 GMC Jimmy "Emmett"
    IN TOO DEEP Off-Road Club
     
  17. Executioner

    Executioner 1/2 ton status

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    Thanks for the attachment, Hey 6.2Blazer is this the spring(s) that you are talking about in a Dana(Spicer)
    Trac-Lok ?

    Hey whoever posted that they see the springs in there diff every time they change diff fluid,
    are these the spring(s) that you see on your Dana(Spicer) Trac-Lok ?
     
  18. 6.2Blazer

    6.2Blazer 1/2 ton status

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    It's a Detroit "Tru-Trac", made by Tractech, and yes they are gear driven so no springs and clutches.
    However, the differential in question is the Dana/Spicer "Trac-Lok" that uses clutches to transfer the power.

    The Auburn diff uses some type of cone shaped clutches......so same concept and function but a different design.
     
  19. Burt4x4

    Burt4x4 3/4 ton status

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    It was I who said I have seen the spring and it is a Dana Power-Lok that I have in my Dana60 rearend. THe Power-Lok is the "big brother" to the Trac-Lok.
    I read some where that Persisson Gear (sp?) is now making the Power-Loks can anyone confirm this??

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  20. Executioner

    Executioner 1/2 ton status

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    Ok, does the spring look like the one you attached ?
     

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